linux-kernel - Re: [PATCH] Revert "drm/msm/dp: set self refresh aware based on PSR support"

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Date:   Mon, 5 Jun 2023 12:02:27 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Bjorn Andersson <andersson@...nel.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Vinod Polimera <quic_vpolimer@...cinc.com>,
        Johan Hovold <johan@...nel.org>, regressions@...ts.linux.dev
Subject: Re: [PATCH] Revert "drm/msm/dp: set self refresh aware based on PSR
 support"

[ +CC: Thorsten and regzbot so they can help with tracking this
regression ]

#regzbot introduced: v6.3..v6.4-rc1

On Tue, May 23, 2023 at 05:16:46PM +0200, Johan Hovold wrote:
> This reverts commit 1844e680d56bb0c4e0489138f2b7ba2dc1c988e3.
> 
> PSR support clearly is not ready for mainline and specifically breaks
> virtual terminals which are no longer updated when PSR is enabled (e.g.
> no keyboard input is echoed, no cursor blink).
> 
> Disable PSR support for now by reverting commit 1844e680d56b
> ("drm/msm/dp: set self refresh aware based on PSR support").
> 
> Cc: Vinod Polimera <quic_vpolimer@...cinc.com>
> Cc: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> ---
> 
> Bjorn reported that PSR support broke virtual terminals two months ago, 
> but this is still broken in 6.4-rc3:
> 
> 	https://lore.kernel.org/lkml/20230326162723.3lo6pnsfdwzsvbhj@ripper/
> 
> despite the following series that claimed to address this:
> 
> 	https://lore.kernel.org/lkml/1680271114-1534-1-git-send-email-quic_vpolimer@quicinc.com
> 
> Let's revert until this has been fixed properly.

Virtual terminals are still broken with 6.4-rc5 on the Lenovo ThinkPad
X13s two weeks after I reported this, and there has been no indication
of any progress in the other related thread:

	https://lore.kernel.org/lkml/ZHYPHnWoDbXB-fqe@hovoldconsulting.com

Seems like it is time to merge this revert to get this sorted.

Rob, Abhinav, Dmitry, can either of you merge this one and get it into
6.4-rc6?

Johan